I’ve heard going very slow pace at first is important. You start to use new muscles and stress yourself in new ways so you need to take it easy until you begin to adapt. If you go fast/fastish too early you can cause damage or get splints I think. Something along the lines of pace as slow as a walker and move to higher speed at you own pace.
The book was fantastic, the movie was absolutely awesome. Definitely one of my top movies. The bugsplatter was done so well. I always wonder how the movie flew under the radar for me for so long after I read the book. I actually didn’t even realise there was a movie until a few years after I read it. Was utterly satisfied when I watched it